Question $4$:

$\backslash (\backslash$square $\backslash )$ How does the Coefficient of Performance $($COP$)$ of a refrigeration cycle change when the evaporator temperature is increased from $\backslash (-10^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ to $\backslash (0^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash ),$ and the condenser temperature remains constant at $\backslash (40^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )?$ Assume the cycle operates as an ideal vapor$-$compression refrigeration system with R$-134$a as the refrigerant.